Agricultural phosphoric acid is a popular ingredient. Despite the availability of phosphorus (P) from geologically distributed reserves around the world, widespread P deficiency in soils limits plant growth and productivity in many parts of the world. For this reason, growers often add this nutrient to their farms to improve crop yield and quality. Polyphosphate is an excellent liquid P fertilizer used to increase agricultural production. Agricultural phosphoric acid is a popular raw material for most commercial phosphate fertilizers. A liquid formulation designed for soil use as an irrigation or irrigation supplement. The positive results of stimulating root growth and lowering soil pH make agricultural phosphoric acid a popular substance.
However, its acidity and some of its chemical properties prevent it from being applied directly. The most common ammonium polyphosphate fertilizers contain N-P₂O₅-K₂O (nitrogen, phosphorus and potassium) 10-34-0 or 11-37-0. Polyphosphate fertilizers offer the advantage of a high nutrient content in a clear, crystalline liquid that remains stable over a wide range of temperatures and is well stored for a long time. Other types of nutrients mix well with polyphosphate fertilizers, making them excellent carriers of micronutrients commonly needed by plants.
A single molecule of phosphate is called orthophosphate. When phosphoric acid and ammonia react, water is released and the orthophosphates bind together to form a “polyphosphate” liquid fertilizer like a chain.
Each bond of phosphate molecules has its own name according to its length, although polyphosphate is a general term that includes all of these related molecules.
In polyphosphate fertilizer, between half and three-quarters of phosphorus is temporarily locked by chain polymers. Residual phosphorus (orthophosphate) is immediately available for plant uptake. Upon exposure to soil, enzymes produced by soil microorganisms and plant roots break down the phosphate polymer chain into simple phosphate molecules that plants can digest, although some polyphosphates decompose even without enzymes. To be. The activity of enzymes is faster in wet and warm soils.
Typically, half of the polyphosphate compounds are converted to orthophosphate within a week or two for plant uptake. In cold, dry conditions, conversion may take longer.
Because polyphosphate fertilizers deliver nutrients to the body immediately and gradually through a combination of both orthophosphate and polyphosphate, plants can use them more effectively and longer.
Liquid phosphoric acid fertilizers are commonly used in manufacturing agriculture, but are not widely used. Farmers like them for convenience and balanced distribution of nutrients, because liquid fertilizers are easily combined with many other nutrients and chemicals, and each drop of liquid is the same as the next drop.
In most cases, growers choose between dry and liquid rather than significant agronomic differences based on nutrient prices, fertilizer preferences, and farm preferences.
Most liquid fertilizers contain ammonium in addition to phosphorus, a substance that is primarily used as a P nutrient source for plants. Because P has limited mobility in most soils, growers should try to place the material practically close to the developing roots. Best practices should be adopted to minimize the movement of P from soil to adjacent water, as excess P in surface water can stimulate the growth of undesirable algae.
Solid phosphoric acid (SPA) catalysts are widely used in the oil industry. Despite the high amount of phosphorus, the catalyst used is generally not reused. In addition, due to the limited lifespan that is achieved industrially, large amounts of catalyst are used, which often need to be disposed of by the SPA landfill.
Can be easily converted into fertilizer. However, the presence of carbon deposits on the catalyst indicates potential environmental hazards. This indicates that these sediments are predominantly polyaromatic (amorphous carbon) with lower amounts of oxygen and aliphatic. Neither the chemical composition nor the physical structure of the catalyst or the presence of coke prevents its use as fertilizer.